QuestionCarbon allotropes / graphite
Graphite is used as a dry lubricant in machines running at high temperature where oil cannot be used as lubricant, because
- (a) graphite has layered structure and the layers are held by van der Waals' forces and cleaves easily between layers
- (b) graphite is a crystalline substance
- (c) graphite conducts electricity and is thermodynamically stable
- (d) each carbon atom in the hexagonal ring undergoes sp² hybridization
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